SpringBoot + ShardingSphere 实现分库分表

ShardingSphere定位为轻量级 Java 框架，在 Java 的 JDBC 层提供的额外服务。 它使用客户端直连数据库，以 jar 包形式提供服务，无需额外部署和依赖，可理解为增强版的 JDBC 驱动，完全兼容 JDBC 和各种 ORM 框架。

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代码实现:

     以用户表为例, 我们需要将它分成2个库，每个库三张表，根据id字段取模确定最终数据的位置
        ds0:
           user_0
           user_1
           user_2
       ds1:
           user_0
           user_1
           user_2

 ds0,ds1两个数据库的三张表的逻辑表都为user表,可以使用以下脚本建表:
    CREATE TABLE `user_0` (
      `id` bigint(11) NOT NULL,
       `name` varchar(20) COLLATE utf8_bin DEFAULT NULL,
       `age` int(11) DEFAULT NULL,
        PRIMARY KEY (`id`)
      ) ENGINE=InnoDB DEFAULT CHARSET=utf8 COLLATE=utf8_bin;
     

     修改pom.xml文件

<?xml version="1.0" encoding="UTF-8"?>
<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
         xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 https://maven.apache.org/xsd/maven-4.0.0.xsd">
    <modelVersion>4.0.0</modelVersion>
    <parent>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-parent</artifactId>
        <version>2.3.0.RELEASE</version>
        <relativePath/> <!-- lookup parent from repository -->
    </parent>
    <groupId>com.mscloudmesh.sharding</groupId>
    <artifactId>springboot-shardingsphere</artifactId>
    <version>0.0.1-SNAPSHOT</version>
    <name>springboot-shardingsphere</name>
    <description>springboot-shardingsphere</description>

    <properties>
        <java.version>1.8</java.version>
        <mybatis-plus.version>3.1.1</mybatis-plus.version>
        <sharding-sphere.version>4.1.0</sharding-sphere.version>
        <mysql-connector.version>8.0.18</mysql-connector.version>
    </properties>

    <dependencies>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-web</artifactId>
        </dependency>

        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-test</artifactId>
            <scope>test</scope>
            <exclusions>
                <exclusion>
                    <groupId>org.junit.vintage</groupId>
                    <artifactId>junit-vintage-engine</artifactId>
                </exclusion>
            </exclusions>
        </dependency>


        <dependency>
            <groupId>mysql</groupId>
            <artifactId>mysql-connector-java</artifactId>
            <version>${mysql-connector.version}</version>
        </dependency>
        <dependency>
            <groupId>com.baomidou</groupId>
            <artifactId>mybatis-plus-boot-starter</artifactId>
            <version>${mybatis-plus.version}</version>
        </dependency>
        <dependency>
            <groupId>org.apache.shardingsphere</groupId>
            <artifactId>sharding-jdbc-spring-boot-starter</artifactId>
            <version>${sharding-sphere.version}</version>
        </dependency>
        <dependency>
            <groupId>org.apache.shardingsphere</groupId>
            <artifactId>sharding-jdbc-spring-namespace</artifactId>
            <version>${sharding-sphere.version}</version>
        </dependency>
        <dependency>
            <groupId>org.projectlombok</groupId>
            <artifactId>lombok</artifactId>
            <version>1.18.12</version>
        </dependency>

    </dependencies>

    <build>
        <plugins>
            <plugin>
                <groupId>org.springframework.boot</groupId>
                <artifactId>spring-boot-maven-plugin</artifactId>
            </plugin>
        </plugins>
    </build>

</project>

 mybatis-plus配置信息类: 

package com.mscloudmesh.sharding.springbootshardingsphere.config;

import com.baomidou.mybatisplus.core.parser.ISqlParser;
import com.baomidou.mybatisplus.extension.parsers.BlockAttackSqlParser;
import com.baomidou.mybatisplus.extension.plugins.PaginationInterceptor;
import com.baomidou.mybatisplus.extension.plugins.PerformanceInterceptor;
import org.mybatis.spring.annotation.MapperScan;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;

import java.util.ArrayList;
import java.util.List;

/**
 * @author kevin
 * @date 2020/6/8
 * @desc mybatis-plus配置类
 */
@Configuration
@MapperScan("com.mscloudmesh.sharding.springbootshardingsphere.dao")
public class MybatisPlusConfig {
    
    @Bean
    public PaginationInterceptor paginationInterceptor() {
        PaginationInterceptor paginationInterceptor = new PaginationInterceptor();
        List<ISqlParser> sqlParserList = new ArrayList<>();
        sqlParserList.add(new BlockAttackSqlParser());
        paginationInterceptor.setSqlParserList(sqlParserList);
        return new PaginationInterceptor();
    }

    
    @Bean
    public PerformanceInterceptor performanceInterceptor() {
        return new PerformanceInterceptor();
    }
}

 用户实体类:

package com.mscloudmesh.sharding.springbootshardingsphere.model;
import com.baomidou.mybatisplus.annotation.TableName;
import lombok.AllArgsConstructor;
import lombok.Data;
import lombok.NoArgsConstructor;

import java.util.Date;

/**
 * @author kevin
 * @date 2020/6/8
 * @desc 用户实现类
 */
@Data
@TableName("user")
@AllArgsConstructor
@NoArgsConstructor
public class User {
    private Long id;
    private String name;
    private int age;

}

用户dao接口类:
  

package com.mscloudmesh.sharding.springbootshardingsphere.dao;
import com.baomidou.mybatisplus.core.mapper.BaseMapper;
import com.mscloudmesh.sharding.springbootshardingsphere.model.User;
/**
 * @author kevin
 * @desc 订单dao层
 */
public interface UserMapper extends BaseMapper<User> {
}

用户服务接口：
  

package com.mscloudmesh.sharding.springbootshardingsphere.service;
import com.baomidou.mybatisplus.extension.service.IService;
import com.mscloudmesh.sharding.springbootshardingsphere.model.User;
/**
 * @author kevin
 * @desc 用户服务接口
 * @date 2020/6/8
 */
public interface UserService extends IService<User> {
}

用户服务实现层：
  

package com.mscloudmesh.sharding.springbootshardingsphere.service.impl;
import com.baomidou.mybatisplus.extension.service.impl.ServiceImpl;
import com.mscloudmesh.sharding.springbootshardingsphere.dao.UserMapper;
import com.mscloudmesh.sharding.springbootshardingsphere.model.User;
import com.mscloudmesh.sharding.springbootshardingsphere.service.UserService;
import org.springframework.stereotype.Service;
/**
 * @author kevin
 * @date 2020/6/8
 * @desc 用户服务实现层
 **/

@Service
public class UserServiceImpl extends ServiceImpl<UserMapper, User> implements UserService {
}

springboot启动类:
  

package com.mscloudmesh.sharding.springbootshardingsphere;

import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;

@SpringBootApplication
public class SpringbootShardingsphereApplication {

    public static void main(String[] args) {
        SpringApplication.run(SpringbootShardingsphereApplication.class, args);
    }

}

测试类userController:

  

package com.mscloudmesh.sharding.springbootshardingsphere.controller;


import com.mscloudmesh.sharding.springbootshardingsphere.model.User;
import com.mscloudmesh.sharding.springbootshardingsphere.service.UserService;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.RestController;

@RestController
public class UserController {

    @Autowired
    private UserService userService;

    @GetMapping("/add")
    public User add() {
        User user = new User();
        user.setName("test");
        user.setAge(30);
        userService.save(user);
        return user;
    }
}
请求 http://localhost:8761/add
控制台输出: